Kotlin vs Java

Kotlin vs Java: What to Choose for Android Development


Welcome to this Kotlin vs Java comparison blog! Java and Kotlin are two popular programming languages used in the software development sector.

Java has been around for over two decades, and it remains one of the most popular programming languages today. On the other hand, Kotlin is a relatively new programming language that has gained popularity in recent years, especially among Android developers. The popularity of Kotlin has been growing ever since this announcement. This has influenced a lot of specialists to predict the collapse of Java as we know it as far as mobile development is concerned. We got to the root of the topic to see how Kotlin & Java fares so that you are able to see how the two stack up against each other and who is the winner.

In the past few years Kotlin was able to successfully take ahead of Java as the number one development language. This language is preferred for android app development. Because of a number of features which we will outline in this blog, it was able to dethrone Java at least as far as Android app development is concerned. With the ability to perform far better and being faster than Java, it was able to successfully take the crown.

Let us take a look at what makes Kotlin so popular as compared to its older sibling Java. Especially in the case of Android app development, it seems to have taken the lead from Java.


What is Kotlin?

Kotlin is an open-source programming language in use by developers to create software and apps for a wide range of devices. It’s popular because it’s simple to understand and write, and it can operate on various platforms, including computers, phones, and even watches. 

Programmers consider it a tool for creating digital objects such as applications and websites. It’s similar to a language both the programmer and the computer can comprehend, and Kotlin is one of the alternatives. 

What is Java?

Java is a computer programming language developed in 1991 by a developers group led by James Gosling. Moreover, it was originally known as “OAK” but was subsequently renamed Java.

Java is a powerful programming language used to develop various applications and services. It is similar to other well-known programming languages such as C++ and BASIC. Java is an Object Oriented Programming Language (OOPL) that is intended to describe objects and their interactions.

Kotlin is a programming language that may be used instead of Java to design Android apps.

One of the primary arguments for utilizing Kotlin is that it may minimize the amount of code required to construct an app, resulting in more efficient development. On the other hand, Java is still a popular language for Android programming and is promoted by Google.


Kotlin vs Java- Key Difference: 


  • Syntax:

Compared to Java, Kotlin has a more concise syntax and uses fewer lines of code to achieve the same results. Additionally, Kotlin’s modern programming concepts making its syntax more intuitive to beginners. 


  • Performance:

In comparison to Java, Kotlin is relatively new, so it has not been optimized as much as Java. Despite its speed and high performance, Kotlin is not as well known as Java. 

  • Ease of Use: 

There are more modern features in Kotlin than in Java, including null safety and extension functions, making it easier to write clean and concise code. Kotlin is designed to be easier to use than Java. Due to the complexity and complexity of its features and syntax, Java has a steeper learning curve. 

  • Popularity: 

The Java programming language has been around for a long time and has an established developer community, further, making it a very popular programming language for various purposes. The Kotlin programming language, on the other hand, is a relatively new language with a smaller community, but in recent years, it has gained popularity, particularly in Android development. 


  • Development Tools and Frameworks: 

Compared to Java, which has a longer lifespan, Kotlin offers fewer tools and frameworks, but they are more modern and specifically designed for Kotlin. Java has a wider range of development tools and frameworks available, whereas Kotlin has fewer varieties. 

  • Null Safety:

Null safety is a feature in Kotlin that prevents null pointer exceptions from occurring in code. Hence, It is accomplished by using nullability annotations and the Elvis operator. Null safety is not native to Java, but there are libraries and best practices for mitigating exceptions caused by null pointers.  

  • Functional Programming:

Functional programming concepts are strongly supported in Kotlin, like lambda expressions and higher order functions, while Java also supports these concepts, but the support is not as robust.  

  • Use Cases:

It is common for both Java and Kotlin programming languages to be used for a wide range of applications. Java is especially popular for enterprise applications, web development, and Android apps. Because of its modern features and concise syntax, Kotlin is gaining popularity in Android development, but it can also be used in server-side development and data science.


Read More: Flutter vs Java


Kotlin vs Java: Comparison Table:

Features  Java 


Primitive Type   Java In Java, primitive types is not objects. There are eight basic data types: byte, short, int, long, float, double, boolean, and char. Primitive types are objects in Kotlin that have the same data types as objects, but it also contains an extra type called “Unit” that represents a type with only one value and is used when no other value is required.
Product Sun Microsystems created Java as a programming language in the 1990s. It is an Oracle Corporation product.  JetBrains, the company behind the IntelliJ IDEA IDE, created Kotlin, a newer programming language.
Used for  Java is general-purpose programming languages, which means they may be used for a broad range of applications, from web development to mobile app development. Kotlin, too, is a General Purpose Language used to create server-side apps and Android applications.
Concise In comparison to Kotlin, the code is not as succinct. Kotlin is widely regarded as being more succinct than Java. It cuts down on boilerplate code.
Checked Exceptions Up against Kotlin, Java contains a feature called “checked exceptions,” which implies that the compiler will compel the programmer to handle specific errors. It is not necessary to catch or disclose any exceptions. Kotlin, on the other hand, lacks checked exceptions, which means that the programmer is not required to handle errors
Casting Java has a wide user community. Java’s community is larger and more established than Kotlin’s. Kotlin has grown in prominence recently, with a burgeoning developer community. Its user base is not as large as that of Java.
Extension Function  There are no extension functions in Java.  Extension functions can be written in Kotlin.
Widening Conversion  Java supports widening conversions, which allows us to convert a smaller type to a larger one. Widening conversions are not supported in Kotlin.  As a result, we cannot transform the smaller type to a larger one.
File Extension  The “.java” file extension is used for Java files. The “.kt” file extension is used for Kotlin files.
Community Support  Java has a wide user community. Java’s community is larger and more established than Kotlin’s. Kotlin has grown in prominence in recent years, with a burgeoning developer community. However, its user base is nor too large as that of Java.
Compilation Time Java takes less time to compilation.  Kotlin’s compilation time is slower than Java.
Code Comparison  Java code is typically thought to be less understandable.As compared to Kotlin, the code line is simply twice. Kotlin-written code is typically thought to be more readable. It divides the code line into two.


This was a Comparison Between Java vs Kotlin lets look at some advantages of Kotlin & Java.


Advantages of Kotlin

  • Shared Codebase, with the Kotlin Multiplatform framework, developers may build a single codebase that targets many platforms at the same time, saving time and effort.
  • Kotlin is compatible with current Java codebases because it can interchange and consume information from Java in various ways.
  • However, Kotlin has built-in null safe support, which helps avoid null pointer exceptions, a common problem in Java, and is notably useful in Android development.
  • Kotlin offers user-friendly and comprehensible coding rules that make it easy for developers to learn and utilize the language.
  • Kotlin’s compact and powerful syntax again, makes it easy to understand and create code, lowering the risk of mistakes.
  • Kotlin separates enormous programs into smaller, more accessible layers, making code maintenance and updating easier.
  • Additionally, Kotlin provides an easy and automatic manner of building data classes, decreasing the amount of boilerplate code necessary.
  • Extension functions in Kotlin allow developers to enhance the capabilities of existing classes and make code more flexible.
  • Kotlin has function types & specific language constructs like lambda expressions, making it simpler to create and comprehend functional code. 
  • Also, Kotlin is a statically-typed language, which makes it simple to understand and write and reduces the possibility of mistakes.

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Advantages of Java

  • Errors are easily detected and resolved because Java employs verified exceptions, implying mistakes are discovered before the program is run. This makes it easy to detect and resolve issues.
  • Also, Java’s libraries are simple to explore, making it easier for developers to locate the tools they need to construct their applications.
  • Java offers rich documentation, making it easy for developers to understand and utilize the language.
  • There is a huge pool of professional Java developers accessible, and finding skillful developers to work on Java projects is easy.
  • Java provides a large choice of third-party libraries that may assist developers in speeding up development and adding additional functionality to their projects.
  • Moreover, Java allows developers to construct standard programs and reusable code that may be utilized across several projects. 
  • Java is a multi-threaded environment, which implies that developers may do several activities in a program at the same time.
  • Java is well-known for its great performance, making it a popular choice for developing high-performance applications.

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Also Read: Java vs NodeJS



It is indeed that Kotlin is the future of Android app development. With its abundance of community support and learning materials that you can find online, app developers can use Kotlin to develop apps for the Android platform. Kotlin is a successor to Java for Android app development.  You can get multiple benefits when you use Kotlin for your android app.  If you are looking to develop an Android app for your business then you should contact us at enquiry@nimapinfotech.com with your requirements. 

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